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Date: Thu, 14 Jun 2012 11:35:32 -0600
From: David Ahern <dsahern@...il.com>
To: rostedt@...dmis.org, acme@...stprotocols.net,
linux-kernel@...r.kernel.org, weisbec@...il.com
Cc: namhyung.kim@....com, mingo@...nel.org, peterz@...radead.org,
David Ahern <dsahern@...il.com>
Subject: [RFC PATCH 1/2] libtraceevent: Add support for tracecmd plugins
Plugin code pulled from trace-cmd repository as of 9a5cd1c1,
cherry-picked the plugin loading functions from trace-util.c
and declarations in trace-cmd.h
Signed-off-by: David Ahern <dsahern@...il.com>
---
tools/lib/traceevent/Makefile | 2 +-
tools/lib/traceevent/tracecmd-plugins.c | 280 +++++++++++++++++++++++++++++++
tools/lib/traceevent/tracecmd-plugins.h | 34 ++++
3 files changed, 315 insertions(+), 1 deletion(-)
create mode 100644 tools/lib/traceevent/tracecmd-plugins.c
create mode 100644 tools/lib/traceevent/tracecmd-plugins.h
diff --git a/tools/lib/traceevent/Makefile b/tools/lib/traceevent/Makefile
index 3d69aa9..b1833ff 100644
--- a/tools/lib/traceevent/Makefile
+++ b/tools/lib/traceevent/Makefile
@@ -188,7 +188,7 @@ $(obj)/%.o: $(src)/%.c
%.o: $(src)/%.c
$(Q)$(call do_compile)
-PEVENT_LIB_OBJS = event-parse.o trace-seq.o parse-filter.o parse-utils.o
+PEVENT_LIB_OBJS = event-parse.o trace-seq.o parse-filter.o parse-utils.o tracecmd-plugins.o
ALL_OBJS = $(PEVENT_LIB_OBJS)
diff --git a/tools/lib/traceevent/tracecmd-plugins.c b/tools/lib/traceevent/tracecmd-plugins.c
new file mode 100644
index 0000000..24b004a
--- /dev/null
+++ b/tools/lib/traceevent/tracecmd-plugins.c
@@ -0,0 +1,280 @@
+/*
+ * Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@...hat.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License (not later!)
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <dirent.h>
+#include <ctype.h>
+#include <errno.h>
+#include <dlfcn.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/mount.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include "tracecmd-plugins.h"
+
+#define LOCAL_PLUGIN_DIR ".trace-cmd/plugins"
+
+int tracecmd_disable_sys_plugins;
+int tracecmd_disable_plugins;
+
+
+static struct trace_plugin_options {
+ struct trace_plugin_options *next;
+ char *plugin;
+ char *option;
+ char *value;
+} *trace_plugin_options;
+
+#define _STR(x) #x
+#define STR(x) _STR(x)
+
+#ifndef MAX_PATH
+# define MAX_PATH 1024
+#endif
+
+static struct plugin_list {
+ struct plugin_list *next;
+ char *name;
+ void *handle;
+};
+
+static void update_option(const char *file, struct plugin_option *option)
+{
+ struct trace_plugin_options *op;
+ char *plugin;
+
+ if (option->plugin_alias) {
+ plugin = strdup(option->plugin_alias);
+ if (!plugin)
+ die("malloc");
+ } else {
+ char *p;
+ plugin = strdup(file);
+ if (!plugin)
+ die("malloc");
+ p = strstr(plugin, ".");
+ if (p)
+ *p = '\0';
+ }
+
+ /* first look for named options */
+ for (op = trace_plugin_options; op; op = op->next) {
+ if (!op->plugin)
+ continue;
+ if (strcmp(op->plugin, plugin) != 0)
+ continue;
+ if (strcmp(op->option, option->name) != 0)
+ continue;
+
+ option->value = op->value;
+ option->set = 1;
+ goto out;
+ }
+
+ /* first look for unnamed options */
+ for (op = trace_plugin_options; op; op = op->next) {
+ if (op->plugin)
+ continue;
+ if (strcmp(op->option, option->name) != 0)
+ continue;
+
+ option->value = op->value;
+ option->set = 1;
+ break;
+ }
+
+ out:
+ free(plugin);
+}
+
+static void load_plugin(struct pevent *pevent, const char *path,
+ const char *file, void *data)
+{
+ struct plugin_list **plugin_list = data;
+ pevent_plugin_load_func func;
+ struct plugin_list *list;
+ struct plugin_option *options;
+ const char *alias;
+ char *plugin;
+ void *handle;
+
+ plugin = malloc_or_die(strlen(path) + strlen(file) + 2);
+
+ strcpy(plugin, path);
+ strcat(plugin, "/");
+ strcat(plugin, file);
+
+ handle = dlopen(plugin, RTLD_NOW | RTLD_GLOBAL);
+ if (!handle) {
+ warning("cound not load plugin '%s'\n%s\n",
+ plugin, dlerror());
+ goto out_free;
+ }
+
+ alias = dlsym(handle, PEVENT_PLUGIN_ALIAS_NAME);
+ if (!alias)
+ alias = file;
+
+ options = dlsym(handle, PEVENT_PLUGIN_OPTIONS_NAME);
+ if (options) {
+ while (options->name) {
+ update_option(alias, options);
+ options++;
+ }
+ }
+
+ func = dlsym(handle, PEVENT_PLUGIN_LOADER_NAME);
+ if (!func) {
+ warning("cound not find func '%s' in plugin '%s'\n%s\n",
+ PEVENT_PLUGIN_LOADER_NAME, plugin, dlerror());
+ goto out_free;
+ }
+
+ list = malloc_or_die(sizeof(*list));
+ list->next = *plugin_list;
+ list->handle = handle;
+ list->name = plugin;
+ *plugin_list = list;
+
+ pr_stat("registering plugin: %s", plugin);
+ func(pevent);
+ return;
+
+ out_free:
+ free(plugin);
+}
+
+static void
+trace_util_load_plugins_dir(struct pevent *pevent, const char *suffix,
+ const char *path,
+ void (*load_plugin)(struct pevent *pevent,
+ const char *path,
+ const char *name,
+ void *data),
+ void *data)
+{
+ struct dirent *dent;
+ struct stat st;
+ DIR *dir;
+ int ret;
+
+ ret = stat(path, &st);
+ if (ret < 0)
+ return;
+
+ if (!S_ISDIR(st.st_mode))
+ return;
+
+ dir = opendir(path);
+ if (!dir)
+ return;
+
+ while ((dent = readdir(dir))) {
+ const char *name = dent->d_name;
+
+ if (strcmp(name, ".") == 0 ||
+ strcmp(name, "..") == 0)
+ continue;
+
+ /* Only load plugins that end in suffix */
+ if (strcmp(name + (strlen(name) - strlen(suffix)), suffix) != 0)
+ continue;
+
+ load_plugin(pevent, path, name, data);
+ }
+
+ closedir(dir);
+
+ return;
+}
+
+void trace_util_load_plugins(struct pevent *pevent, const char *suffix,
+ void (*load_plugin)(struct pevent *pevent,
+ const char *path,
+ const char *name,
+ void *data),
+ void *data)
+{
+ char *home;
+ char *path;
+ char *envdir;
+
+ if (tracecmd_disable_plugins)
+ return;
+
+/* If a system plugin directory was defined, check that first */
+#ifdef PLUGIN_DIR
+ if (!tracecmd_disable_sys_plugins)
+ trace_util_load_plugins_dir(pevent, suffix, PLUGIN_DIR,
+ load_plugin, data);
+#endif
+
+ /* Next let the environment-set plugin directory override the system defaults */
+ envdir = getenv("TRACE_CMD_PLUGIN_DIR");
+ if (envdir)
+ trace_util_load_plugins_dir(pevent, suffix, envdir, load_plugin, data);
+
+ /* Now let the home directory override the environment or system defaults */
+ home = getenv("HOME");
+
+ if (!home)
+ return;
+
+ path = malloc_or_die(strlen(home) + strlen(LOCAL_PLUGIN_DIR) + 2);
+
+ strcpy(path, home);
+ strcat(path, "/");
+ strcat(path, LOCAL_PLUGIN_DIR);
+
+ trace_util_load_plugins_dir(pevent, suffix, path, load_plugin, data);
+
+ free(path);
+}
+
+struct plugin_list *tracecmd_load_plugins(struct pevent *pevent)
+{
+ struct plugin_list *list = NULL;
+
+ trace_util_load_plugins(pevent, ".so", load_plugin, &list);
+
+ return list;
+}
+
+void tracecmd_unload_plugins(struct plugin_list *plugin_list)
+{
+ pevent_plugin_unload_func func;
+ struct plugin_list *list;
+
+ while (plugin_list) {
+ list = plugin_list;
+ plugin_list = list->next;
+ func = dlsym(list->handle, PEVENT_PLUGIN_UNLOADER_NAME);
+ if (func)
+ func();
+ dlclose(list->handle);
+ free(list->name);
+ free(list);
+ }
+}
diff --git a/tools/lib/traceevent/tracecmd-plugins.h b/tools/lib/traceevent/tracecmd-plugins.h
new file mode 100644
index 0000000..1a65d50
--- /dev/null
+++ b/tools/lib/traceevent/tracecmd-plugins.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2008, 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@...hat.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License (not later!)
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+#ifndef _TRACECMD__PLUGINS_H
+#define _TRACECMD__PLUGINS_H
+
+#include <stdlib.h>
+#include "event-parse.h"
+
+extern int tracecmd_disable_sys_plugins;
+extern int tracecmd_disable_plugins;
+
+struct plugin_list;
+struct plugin_list *tracecmd_load_plugins(struct pevent *pevent);
+void tracecmd_unload_plugins(struct plugin_list *list);
+
+#endif /* _TRACECMD__PLUGINS_H */
--
1.7.10.1
--
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